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chaincode_start.go
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129 lines (99 loc) · 3.99 KB
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/*
Copyright IBM Corp 2016 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"errors"
"fmt"
"github.com/hyperledger/fabric/core/chaincode/shim"
)
// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct {
}
// ============================================================================================================================
// Main
// ============================================================================================================================
func main() {
err := shim.Start(new(SimpleChaincode))
if err != nil {
fmt.Printf("Error starting Simple chaincode: %s", err)
}
}
// Init resets all the things
func (t *SimpleChaincode) Init(stub *shim.ChaincodeStub, function string, args []string) ([]byte, error) {
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting 1")
}
err := stub.PutState("hello_world", []byte(args[0])) //course sample
if err != nil { //course sample
return nil, err //course sample
}
return nil, nil
}
// Invoke is our entry point to invoke a chaincode function
func (t *SimpleChaincode) Invoke(stub *shim.ChaincodeStub, function string, args []string) ([]byte, error) {
fmt.Println("invoke is running " + function)
// Handle different functions
if function == "init" { //initialize the chaincode state, used as reset
return t.Init(stub, "init", args)
} else if function == "write" { //course sample
return t.write(stub, args) //course sample
}
fmt.Println("invoke did not find func: " + function) //error
return nil, errors.New("Received unknown function invocation: " + function)
}
func (t *SimpleChaincode) write(stub *shim.ChaincodeStub, args []string) ([]byte, error) { //course sample
var name, value string
var err error
fmt.Println("running write()")
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2. name of the variable and value to set")
}
name = args[0] //rename for fun
value = args[1]
err = stub.PutState(name, []byte(value)) //write the variable into the chaincode state
if err != nil {
return nil, err
}
return nil, nil
}
// Query is our entry point for queries
func (t *SimpleChaincode) Query(stub *shim.ChaincodeStub, function string, args []string) ([]byte, error) {
fmt.Println("query is running " + function)
// Handle different functions
/*if function == "dummy_query" { //read a variable
fmt.Println("hi there " + function) //error
return nil, nil;
}
fmt.Println("query did not find func: " + function) //error
return nil, errors.New("Received unknown function query: " + function)*/
// Handle different functions
if function == "read" { //read a variable
return t.read(stub, args)
}
fmt.Println("query did not find func: " + function)
return nil, errors.New("Received unknown function query")
}
func (t *SimpleChaincode) read(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
var name, jsonResp string
var err error
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting name of the var to query")
}
name = args[0]
valAsbytes, err := stub.GetState(name)
if err != nil {
jsonResp = "{\"Error\":\"Failed to get state for " + name + "\"}"
return nil, errors.New(jsonResp)
}
return valAsbytes, nil
}